A146708 Number of n X n binary arrays symmetric under horizontal and vertical reflection with all ones connected only in a 1100-1111-0100 pattern in any orientation.

1, 1, 1, 1, 1, 1, 1, 1, 17, 17, 49, 49, 329, 329, 4511, 4511, 91215, 91215, 2775809, 2775809, 118081991, 118081991

Offset

1,9

Links

Table of n, a(n) for n=1..22.

Example

Maximal 9 X 9 example
.0.0.0.0.0.0.0.0.0
.0.0.1.0.0.0.1.0.0
.1.1.1.1.0.1.1.1.1
.0.0.1.1.0.1.1.0.0
.0.0.0.0.0.0.0.0.0
.0.0.1.1.0.1.1.0.0
.1.1.1.1.0.1.1.1.1
.0.0.1.0.0.0.1.0.0
.0.0.0.0.0.0.0.0.0

Crossrefs

Sequence in context: A146636 A146833 A146700 * A146463 A146841 A147180

Adjacent sequences: A146705 A146706 A146707 * A146709 A146710 A146711

Keyword

nonn

Author

R. H. Hardin, Nov 04 2008

Status

approved